Speedboat hull



June 28, 1949. R. 1.. HARVEY SPEEDBOAT HULL 2 Sheets-Sheet 1 Filed June30, 1945 INVENTOR.

June 28, 1949.

Filed June 50, 1945 R. L- HARVEY SPEEDBOAT HULL 2 Sheefis-Sheet 2INVENTOR.

' fake! a: fi lfy BY waned 1 Patented June 28, 1949 1 JUN'sPEEDBoATfiULL .ai Robert L. ,Har;yey,i;1ietrpit, Mich. ApplicationJune 30, 1945, Serial No. 602 525 4 Qlaims. (Cl, 1 14 66.5)

This inventionrelates to improvements'inthe design of speed boathulls.An object is toprovide an improved: design of speed boat hull'which-willenable itheihull to be driven over the water at a majimumrrate of speedwith a minimum amount of power.

Another object is to provide a speed .boat hull so designed that thehull willtravel at a;,h1gh

rate of speed over the water withoutjumping or bouncing and willmaintain-a.substantiallyeven straight line of travel.

Another obect is to provide a speed .boathull of the characterheretofore described, so constructed that the hull will-followadetermmed course without deviation therefrom.- The boat will rapidlyand gradually attain a maximum. rate of speed rising gradually in thewater as it does so and will then travelon an even keel over and throughthe water.

The hull is so constructed that it does not push up a mass of waterahead of the bow but so di-H:

Figure 1 is a side elevation of-a boathull embodying my invention.

Figure 2 is a plan ofthe bottomof the hull. Figure 3 is afrontelevationlooking toward the bow.

Figure 4 is a vertical sectional-view taken on the line 4-4 of Figure 1.

Figure 5 is a vertical sectional view. taken on the line 5--5 of Figure1.

Figure 6 is avertical sectional view taken on the line 6-6 of Figure 1'.

Figure 7 is a vertical sectional view taken on the line 1--7 of Figure1.

Figure 8 is a vertical sectional viewataken on the line 88 of Figur'l.

Figure 9 is avertical the line 99 of Figure'l.

1 Figure 10 isaverticalsectional view taken on the line III-l0 of Figure1.

Figure 11 is afragmentary perspective, partially in section illustratingthe manner in which the step fades out as it approaches the, keel.

The improved speed. boat hull design of ,my

Uinvention is. intended to. enable the hull to .at-

tain a high-speed with the same amount of power that other conventionalhulls having the same general hull dimensions. .My improved ,;de sign.willgalso enab1e.. a,,h.u11 .to. travelat aihighi Speed at an even keelwithout jumpin as it travels over the water. As embodied in a hulldesign of a model speed boat size this improved hull at- 60 .com leentaryrom n ics '4: .s t Sides Q halmel. fin a sectional view taken on.tained-a. speed. several niles an. hour. fasten than other:.conventionahspeed, boat .hulls of thesame dimensions and. utilizing thesamev size of .motor and wheel.

,Throughout thewdrawings the hull.i11ustrated is shown as providedhwitha keelfin 2l1rwhich extends fro'mthebow to thestern and: which has adepth from a point adjacent to the vertical lineofmtheiforwaiidupoint,ofi the bow to the step as v shown in I'liurellgreatenthan at anyiother point drearwardly oi. thes ep The k elfin2.1L extends fr0m its forward point to the stepina-substan- .tiallyhorizon alnlane. iliromthe step, wh re i i substantially onal n lwi h ht p 2 bit rad ly, sl p -upwar lymtoward the. stern and to a po nt n etmediatethes .paand the ster flr ...J.h p n it; extends aft. to the,stemsubstam ti l onastrai htl r'l e ,hul .i rrovided at heiboww the pa rf d s ed i opp XtQnQi dQ s co qavit war y a t owardthes su 1- H exte uiverdl a e lly each s e. a avir m -thek e finandterm n te ins abiliensur a es 28 w h urfac s ermiue e imm d a lyadiesent to thestep in;substantially flat horizontal plane surh e s assho iniff eu lrzua dJrheses p fi f su faces i Ra Mm. 11? @1. biifi width of the .qongavities26.'- The ;concavities ,merge gradually into he keel and thecurye'alsois gradual v outwardly, and downwardly until ,it

merges n liti' i ta er surfee pqr io h i u lm trhe'h illeu prinesrarconsistsof a pair of tsemplsmien r substa t a m-surfa es 3. in

' thefigures of the drawing. jl hese surtaces also e ra u l y-i flameel. n n an -ta er in Wi e re ed filf hes n towa the stern. The bottom.surface q i pposite, sides 40 Q he eelan ediw ntih reto n whi i u es hes e o the k el s m r es-i he b t m o ithahu isis bs an ia rflush as itpasses, over the; step so ,-,that the concavities {extend u h bv r, test p atev t m ed a 4fis iee nt tam -.kee fin ssho The bott m surfacesof the h lll,upQn..Opposite ,sides of.the

tk tb w n the. downwar y d qutw rd toward such stabiliz r (su a e HflShQW IiI F retfiiorm n t eistep. o emtq d t th r i no t mm d a ijacentto th keel becausedthebottoms ofuthe iconcavities adia-centtorthe keel;extend flush with g the surfaces 30.10.1117, the step beginsrandincreases gradually in .rdepth-as shown by the downward cu rvature. of,the dines 2 6. in, Figure 6, and reaches 1 itsmaximumdrop inthe surfaces28.

.The ,width ofnthe.ihullat they step is greater ab 1i e .:.surfa es, 28.,extend as it appears in Figure 2 than the width of the hull aft of thestep. The stabilizer plane surfaces are shown in Figure 2 as projectingoutby the dotted line BB. As maximum speed is attained the keel dividesthe water at the bow and relative to the hull the water passes outwardlyand rearwardly through the concavities 2B and the hull travels evenlyover this water spray on a substantially even keel rather than bouncingor jumping from one wave to the next. Notwithstanding the rise of theboat as it attains speed relative to the water the keel fin is submergedsubstantially throughout the length of the boat so that the hull followsa determined I course without danger of variation therefrom.

What I claim is:

1. A boat hull having a keel fin extending longitudinally substantiallyfrom the bow to the stern and having a step disposed nearer to the bowthan to the stern, said bow having complementary concavities on oppositesides of the keel and extending aft from substantially the bow to thestep and increasing in width from the bow to the step and terminatinglaterally in chines dropped vertically below the bottoms of theconcavities intermediate the keel and the chines, and terminatinglaterally adjacent to the step in complementary substantially horizontalstabilizer planes spaced on opposite sides from the keel fin by thewidth of the concavities and dropped below the bottoms of theconcavities intermediate the keel and said planes, the bottom of thehull abaft the step and on opposite sides of the keel fin consisting oftwo complementary substantially horizontal plane surfaces saidcomplementary plane surfaces merging substantially fiush with thebottoms of the concavities adjacent to the keel on a line with the step,said keel fin having a depth forwardly of the step greater than itsdepth aft of the step.

2. A boat hull having a step disposed in closer relationship to the bowthan to the stern and having a keel fin extending longitudinallysubstantially from the bow to the stern, said hull having complementaryconcavities on opposite sides of the keel fin and extending aft fromsubstantially the bow to a point substantially in line with the step andterminating laterally at the chines along lines spaced below the bottomsof the concavities intermediate the chines and the keel, saidconcavities terminating laterally adjacent to the step in complementarysubstantially horizontal stabilizer planes spaced on opposite sides fromthe keel fin by the width of the concavities and spaced vertically belowthe bottoms of the concavities and above the bottom of the keel, thebottom of the hull abaft the step and on opposite sides of the keel finconsisting of two complementary substantially horizontal plane surfaces,said keel fin having a depth forwardly of the step greater than itsdepth aft of the step and sloping upwardly as it extends aft from thestep to a point spaced intermediate the step and the stern from whichpoint it extends aft to the stern in a substantially horizontal plane.

3. A boat hull having a keel fin extending longitudinally substantiallyfrom the bow to the stern and having a step disposed nearer to the bowthan to the stern, said hull shaped providing complementary concavitieson opposite sides of the keel fin extending from the bow graduallydownwardly aft therefrom and terminating aft substantially at the step,said concavities terminating laterally from adjacent to the bow toadjacent to the step in complementary chines dropped below the bottomsof the concavities intermediate the keel and the chines and terminatingat the step and immediately forwardly thereof in substantiallyhorizontal stabilizer plane surfaces spaced on'opposite sides from thekeel fin by the width of the-concavities and providing a hull having abreadth at the step stepped laterally beyond the breadth of the hull aftof the step, the bottom of the hull aft of the step and on oppositesides of the keel fin consisting of two complementary substantiallyhorizontal plane surfaces merging gradually into the keel and merging:dush with the bottoms of the concavities on opposite sides of andadjacent to the keel, said keel fin having a depth -from a pointsubstantially adjacent to the forward point of the bow and aft to thestep greater than the downward projection of the two stabilizer planesand greater than the depth of the keel aft from the step.

4. A boat having a hull provided with a step disposed nearer to the bowthan to the stern and provided with a keel extending from the bow to thestern, said keel having a depth from a point adjacent to the stern andextending to the step greater than the depth of the keel aft 0:" thestep, the bottom of the hull aft of the step consisting of twocomplementary substantially horizontal plane surfaces disposed onopposite sides of the keel, the bottom of the hull forward of the stepprovided with two complementary concavities disposed on opposite sidesof the keel extending substantially from the stem to the step andterminating laterally in chines extending substantially from the stem tothe step, said chines dropped to a point below the bottoms of theconcavities intermediate the chines and the keel and above the bottom ofthe keel, said concavities terminating laterally adjacent to the step incomplementary horizontal flat stabilizer plane surfaces spaced above thebottom of the keel and below the bottoms of the concavities, said hullhaving a breadth immediately forwardly of the step and at the step andover said stabilizer plane surfaces stepped outwardly laterally beyondthe breadth of the hull aft of the step.

ROBERT L. HARVEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

. UNITED STATES PATENTS Number Name Date 1,353,669 Scott Paine Sept. 21,1920 1,826,229 Van Wienen Oct. 6, 1931 FOREIGN PATENTS Number CountryDate 339,508 Great Britain Dec. 11, 1930

